Abstract
Objectives
CT is the clinical standard for surgical planning of craniofacial abnormalities in pediatric patients. This study evaluated three MRI cranial bone imaging techniques for their strengths and limitations as a radiation-free alternative to CT.
Methods
Ten healthy adults were scanned at 3 T with three MRI sequences: dual-radiofrequency and dual-echo ultrashort echo time sequence (DURANDE), zero echo time (ZTE), and gradient-echo (GRE). DURANDE bright-bone images were generated by exploiting bone signal intensity dependence on RF pulse duration and echo time, while ZTE bright-bone images were obtained via logarithmic inversion. Three skull segmentations were derived, and the overlap of the binary masks was quantified using dice similarity coefficient. Craniometric distances were measured, and their agreement was quantified.
Results
There was good overlap of the three masks and excellent agreement among craniometric distances. DURANDE and ZTE showed superior air-bone contrast (i.e., sinuses) and soft-tissue suppression compared to GRE.
Discussions
ZTE has low levels of acoustic noise, however, ZTE images had lower contrast near facial bones (e.g., zygomatic) and require effective bias-field correction to separate bone from air and soft-tissue. DURANDE utilizes a dual-echo subtraction post-processing approach to yield bone-specific images, but the sequence is not currently manufacturer-supported and requires scanner-specific gradient-delay corrections.
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Data availability
The data that support the findings of this study are available from the corresponding author upon reasonable request.
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Funding
Study supported by the National Institutes of Health: NIH R21 DE028417, NIH T32 EB020087, F31 AR079925.
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FWW, HL, HKS, CSR, and SB conceptualized and designed the study; NK acquired the data; NK, BCJ, and CW analyzed and interpreted the data; NK and FWW drafted the initial manuscript; NK, HKS, and FWW reviewed and edited the manuscript; all authors read and approved the final manuscript.
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All procedures performed in this study involving human participants were approved by the University of Pennsylvania’s institutional review board and made in accordance with the 1964 Helsinki declaration and its later amendments.
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Kamona, N., Jones, B.C., Lee, H. et al. Cranial bone imaging using ultrashort echo-time bone-selective MRI as an alternative to gradient-echo based “black-bone” techniques. Magn Reson Mater Phy 37, 83–92 (2024). https://doi.org/10.1007/s10334-023-01125-8
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DOI: https://doi.org/10.1007/s10334-023-01125-8